Cooling means for sewing machines



June 21, 1955 A. c. PETERSON EI'AL 2,711,146

COOLING MEANS FOR SEWING MACHINES 4 Sheets-Sheet 1 Original Filed Aug.2, 1950 FIG. I

&

INVENTORS. ALBERT C. PETERSON JOHN G. ATTWOOD ATTORNEY June 21, 1955 A.c. PETERSON ETAL 2,711,146

coouuc MEANS FOR SEWING MACHINES Original Filed Aug. 2. 1950 v 4sheets-sheet 2 FIG. 2

86 I05 Q "i v INVENTORS.

92 ALBERT C. PETERSON BY JOHN G. ATTWOOD ATTORNEY.

June 21, 1955 A. c. PETERSON ETAL 2,711,146

COOLING MEANS FOR SEWING MACg-IINES Original Filed Aug. '2. 1950 4Sheets-Sheet 3 FIG. 3

INVENTORS. 4 ALBERT c. PETERSON BY JOHN G. ATTWOOD as v . ATTORNEY.

June 21, 1955 ,A. c. PETERSON ETAL I 2,711,146

COOLING MEANS FOR SEWING MACHINES Original Filed Aug. 2. 1950 4Sheets-Sheet 4 minim] E PETER JOHN G. ATTWO BY ATTORNEY.

United States Parent 0 COOLING MEANS FOR SEWING MACHINES Albert C.Peterson, Park Ridge and John G. Attwood, Oak Park, 11]., assignors toUnion Special Machine Company, Chicago, Ill., a corporation of IllinoisOriginal application August 2, 1950, Serial No. 177,154,

now Patent No. 2,684,652, dated July 27, 1954. Divided and thisapplication December 13, 1952, Serial No. 325,856

6 Claims. c1. 112 -218 This invention relates to industrial sewingmachines I.-

continuous and safe operation of the machines at high speeds.

More particularly, the invention relates to machines of the overedgeseaming type and especially-to machines of this character whichare notequipped with completely closed lubricant tight housings. Thisapplication is a division of our pending application, Serial No.177,154, filed on August 2, 1950, now Patent No. 2,684,652, granted July27, 1954. I

As set forth in said parent application, the invention involves a novelarrangement for insuring adequate but not excessive lubrication of theprincipal operating parts of the machine. The arrangement is such thatleakage or spattering' of the lubricant which would result in soilingvthe work or the clothing of the operator and would requirefrequentreplacementof the lubricant is heldto a minimum. p

In conjunction with the improved lubrication features it has been animportant object of the invention to provide simple but effective meansfor removing heat from the operating parts thereby minimizingdeterioration of the lubricant and'enabling long continuous operation ofthe machine at high speeds. Toward the foregoing end the inventioninvolves the provision ofheat dissipating means comprising anarrangement for rapid transfer of heat from the operating parts to theatmosphere within the machine frame and the continuous-removal of theheated air from within the frame. Such means are arranged to performtheir functions, moreover, in such a way that leakage or loss of thelubricant which is being continuously circulated, is held to a minimum.-

Other objects, features, and advantages will appear from the detaileddescription of an illustrative form of the invention which will now begivenin conjunction with the accompanying drawings in which:

Fig. 1 is a view, partly in front elevation and partly in verticalsection, showing an overedgerwith a lubricant reservoir pan mounted in atable top;

Fig. 2 is a sideelevational view-of the machine and reservoir panmounted in a table top which is shown in cross-section, the machine andpan being mounted in a different relation to the table top than in Fig.1;.

Fig. 3 is-a view partly in elevation and-partly inlongitudinal sectionthrough the machinqreservoir pan, and supporting table top, the partsbeingin the same relation as in-Fig;. 2;

Fig; 4 is a detailview, in elevation, of aspecial lubricant deliveryelement, a number of which are embodied in the machine;

Fig.5 is a detail view,in'perspective showing. a guard or deflectorprovided in the machine; 4 J v 6 is an outer face view of a combinedhandwheel and pulley mounted on themairi' shaft of the machine;

the parts in properly assembled relation.

, 2,711,146 Patented June 2 1, 19,55

Fig. 7 is an axial sectional view through the handwheel and pulley;

Fig. 8 is an elevational view showing the inner face of the handwheeland pulley; and

Fig. 9 is a detail view showing in elevation a portion of the frame ofthe machine in the region of the main shaft, the latter being shown insection. Referring now to the drawings, the invention has beenillustrated as applied to an overedge sewing machine of the general typedisclosed in the patents to Christensen et al. No. 1,751,508, grantedMarch 25, 1930; Zeier No. 1,864,391, granted June 21, 1932; Rubel ,No;2,494,901, granted January 17, 1950; and Sauer No. 2,502,346, grantedMarch 28, 1950. It will be understood, however, that the invention isnot limited for use in connection with this specific type of machine.

In Figs. 1, 2 and 3 there is shown, in section; the top 10 of a sewingtable of any suitable construction. On this is mounted a lubricantreservoir panll which serves to carry the sewing machinedesignatedgenerally at 12. The relationship between the table top and the sewingmachine with its connected reservoir pan may be either as indicated inFig. 1 or as indicated in Figs. 2 and 3 In the latter arrangement ahorizontally extending flange lie at the top of the reservoir pan .isdisposed above the top of the table and is supported by a plurality(preferably 4) of vibration isolating members. These may suitably besimilar to those shown in the patent to Thompson No. 1,948,193, grantedFebruary 20, 1934. Each may comprise a central pin or stud 13' having anenlarged lower head portion 13a pressed into and surrounded byacylindrical vibration absorbing element 15 formed of cork or felt orthe like; The lower and' upper ends of element 15 are enclosed andretained by a pair of cuplike members 14 and 16. Pin 13 extends throughan opening in the member 16 from which it projects a suitable distanceto cooperate Withan opening 11b (Fig; 7) provided in the flange 11a ofthe reservoir pan. The pin 13 may be secured in any suitable way to theflange, as by a relatively tight fit or by screw threads or by a knurledor ribbed formation or the like. 7 The vibration absorbing units areadapted to fit snugly into suitable recesses provided in the uppersurface of the top 1'0 of the table. An opening 10a (Figs. 2 and 3) isprovided through the table top to receive the main body of the reservoirpan, this opening being of suitable size to provide the necessaryclearance.

In Fig. 1 there is shown an alternative arrangement of the sewingmachine and reservoir pan in relation to the table top. This may beemployed when it is desired to have the work supporting surface of thesewingmachine closer to the top of the table. The reservoir pan 1'1in'this arrangement is disposed completely below the tabletop; It issuspended in' this position by means of bolts 13b '4 cooperating withthe holes '11b in the flange llaiof the reservoir pan. Nuts 13d aboveand below the flangc'lla serve to retain the pan in any desired positionalong the bolts. To absorb vibration each of the bolts 13])" is Sui"-rounded by an element lfia'formed of cork-oi compressed I felt or othersuitable vibration absorbing materialretained by cup-like elements 14aand 16a; The; upper eiid of each bolt 13b is provided with an enlargedbeen 130' C6- operating with the'upper face of thecup 16a to mairitiiiii When this arrangement of the parts isemployed the table isno't only provided with suitable recesses or pockets to receiveithevibration absorbing members, but the hottoms'of these recesses areprovided with openings through which the bolts 13b may'extenddownwardly.The tabletop is also provided with a somewhat larger opening 141b thanis provided fo r'the arrangements of Figs. 2 and 3 topermit the freepassage of the base 17 of the sewing machine through this opening.

In either of the arrangements described above, the base 17 of the sewingmachine is secured to the flange 11a of the reservoir pan. For thispurpose the base of the machine frame is provided with a plurality oflaterally extending foot portions provided with suitable openingsaligned with threaded openings in the flange of the reservoir pan.Screws 22 (Fig. 2) or 22a (Fig. l) countersunk in the openings in thefoot portions of the sewing machine frame and threaded into the tappedholes in the pan serve to secure the parts in the manner shown.

In upwardly extending portions 17a and 17b of the frame of the sewingmachine, a main operating shaft 23 is journaled. Bearing sleeves orbushings 24 and 25 having a pressfit in suitable openings in the frameserve to support the shaft with its axis inclined somewhat to thehorizontal to facilitate operation of the reciprocating needle in themanner to be explained. At its left end (Fig. 3) the shaft extendsoutwardly from the frame and carries a combined handwheel and pulley 26adapted to receive power for operating the machine by means of a V-belt27 connected, in a manner well understood, with a power driving unitpreferably carried by the table beneath the top 10. This belt passesthrough an opening 27a (Fig. 3) provided in the laterally extendingflange of the reservoir pan. It also passes downwardly through theopening 10a 01' 10b in the table top. At the opposite end of the shaft23 there is carried a crank arm 28 which, through a pivotally connectedlink 29, serves to reciprocate a needle bar 30 mounted in a bearingsleeve 31 carried by the frame of the machine. Needle bar 34) isdisposed at a small acute angle to the vertical, its axis beingperpendicular to that of the shaft 23. A needle 32 carried by the needlebar is thus caused to reciprocate along a line best suited for theproduction of an overedge stitch in conjunction with the complementarystitch forming devices. The latter include an under looper 33 carried byan arm 34 arranged for oscillation, in a manner well known in the art,and also include an overedge looper or spreader 35 carried by an arm 36arranged to impart suitable oscillatory movements to the overedgeelement. The particular form and arrangement and mode of operation ofthe stitch forming devices constitute no part of the present invention.These may, if desired, be constructed in accordance with the abovementioned patent to Zeier No. 1,864,391, or they may, if desired, beformed and arranged in accordance with the patent to Rubel No.2,494,901. Suffice it to say that the loopers or looper and spreader maybe operated by a plurality of eccentrics 37 and 38 (Fig. 3) carried bythe shaft 23. These eccentrics are of the spherical type and cooperatewith straps at the upper ends of pitmans 39 and 46 which are, in turn,connected through suitable mechanism with the looper carriers.

For advancing the work in the course of stitch formation, a feed dog ofconventional form may be employed. The shank 41 of such a feed dog isindicated in Fig. 3, this being secured to a reciprocating bar 42connected by a link 43 with an arm 44 of a feed rocker carried by ashaft 45. Suitable connections are provided from the main shaft foroscillating the feed rocker, these connections including a pitman 46having a strap at its upper end (:0- operating with a sphericaleccentric 47 on the main shaft. Lifting and lowering movements areimparted to the feed dog by a link 48 connected at its lower end in asuitable manner with the feed bar supporting means and at its upper endwith a pin 49 connected by a pitmanSi) with a spherical eccentric 51 onthe main shaft. Pin 49 extends outwardly from an arm 52 pivotallymounted at 53 on the frame, this arm carrying at its outer end a trimmerblade 54. The latter cooperates with a stationary trimmer blade 55(Figs. 1 and 2) suitably mounted below the work supporting surface ofthe machine.

Cooperating with the feed dog in advancing the work 4 p 7 is a presserfoot 56 (Figs. 1 and '2) carried by the forward end of an arm 57 carriedby a rockably mounted shaft journaled in the frame. As will beunderstood the arm 57 is normally spring urged to yieldingly press thepresser foot against the work. Whenever desired, it may be lifted fromthe work by means of an arm 58 (Figs. 2 and 3) secured to the rock shaftcarrying the arm 57. A chain 59 or other suitable connection from thearm 58 may be I attached at its other end to a foot treadleor kneeoperated member for lifting the presser foot when desired.

The improved lubrication system of the machine, in-

volves a main lubricant reservoir 60 at the top of the frame. from themain frame and is secured to the two upstanding portions 17a and 17b ofthe frame by means of a plurality of screws 61 and 62 (Fig. 3).

and convey lubricant by capillary action. of the strip is interposedbetween the top of the main frame extension 17a and an outwardlyextending flange at the bottom of the reservoir casting. Similarly, the

right end of the strip is interposed between the upper reservoir, abovethe level 65, for the introduction of lubricant.

For delivering lubricant from the reservoir to the various eccentrics onthe main shaft 23 there is provided a series of wick filled tubes 72(Figs. 3 and 4) extending through the bottom wall of the reservoir andprojecting downwardly a suitable distance therefrom; Wicking 73 carriedby the tubes extends into the reser.

voir to receive lubricant and conduct it by capillary action to thelower ends of the tubes. At the lowerfend of each tube there is provideda small loop of wire. 74

having its free end soldered or brazed or otherwise secured to the outersurface of the tube 72 adjacent its lower end. These loops 74 arepreferably formed of copper or brass or other metal which may be readilybent and remain set in any desired shape.

As shown in Fig. 3, they may serve to deliver the lubricant directly tothe side surfaces of the severaleccentrics 37, 38, 47 and 51. Therelatively thin character of the wire and the flat form of the loopsenables the latter to fit between closely spacedrparts for the deliveryof the lubricant to precise points. In lieu of the wire loops 74, eachof the tubes 72 may, if desired,

be provided with similarly shaped elements formed of thin sheet materialadapted to be readily bent and re-.

main set in the manner explained. Also a single wire, not looped, may beattached to the lower end of a tube 72 at only one side and bent in thesame manner.

While the wick filled tubes '72 are arranged to deliver I a relativelysmall, regulated amount of lubricant to the eccentrics a certain excessbeyond the actual lubrication requirements of the eccentrics will besupplied..

This excess is thrown by centrifugal force from theeccentrics and aportion is deposited upon the under surface of the strip 63. Bycapillary action the lubricant so received will be delivered to theopposite ends of the strip. The portion delivered toward the left (Fig.3) will be supplied to wicking 75 extending from the un der surface ofthe strip 63 to the, surface of the journaled portion of the shaft 23within the bearing sleeve 24. The frame and bearing sleeve will, ofcourse, be provided with aligned openings for this purpose. 'Wick- Thisreservoir is formed as a casting separate,

Along the .un-' der surface of the reservoir there is provided a flatstrip es of felt or other suitable material adapted to collect The leftend.

This enables the lower ends of the loops to be located closely; adjacentto the point where the lubricant is desired. 7

ing 76 may be provided on the under side of the journaled portion of theshaft and held in engagement with the latter by a spring 77 to insurethe maintenance of an adequate supply of lubricant at the hearing. In asimilar manner the right end of the strip 63 serves to deliver lubricantto the upper end of wicking 78 provided in a vertical passage in theframe communicating with the bearing sleeve 25 and extending through thelatter to the surface of the journaled portion of shaft 23. At anintermediate point the passage containing the wicking 78 communicateswith a laterally extending tube 79 which carries suitable wicking forconducting a small part of the lubricant from the wicking 78 to one ormore of the points requiring lubrication in the needle bar reciprocatingmechanism, such as the pivotal connection between the crank 28 and link29. Beneath the journaled portion of the shaft 23 wicking St) isprovided to maintain an adequate supply of lubricant at the bearing.Excess lubricant will be delivered to a passage 81 from which it isdischarged by a tube 82 to parts beneath it, which may requirelubrication, and some will be returned to the sump.

Turning now to the reservoir pan, this, as best shown in Fig. 3, isprovided with a lubricant receiving space 83 above a large filter member84. Any excess lubricant delivered to the various operating parts of themachine will be returned by gravity to the space 83. The filteringmember 84 is preferably formed of a plurality of layers, the upper andlower of which are relatively coarse screens carrying between them alayer of felt or the like.

Beneath the filter member 84, a downwardly extending portion 86 of thereservoir pan provides a sump for the accumulation of the excesslubricant. In a thickened wall portion 87 of the sump there is mounted acylindrical pump housing 88 having a radially extending flange 89secured .by screws 90 or the like to the outer face of the wall 87. Asuitable gasket is preferably provided between the fiange Y89 and theouter face of the wall. Within the member 88 there is journaled a shaft91 which carries on its outer end a pulley 92. The latter is arranged tocooperate with the outer face of one branch of the belt 27 in itspassage from the pulley of the power .drive (.not shown) to the pulley26 of the sewing machine. carries a gear 93 which may, if desired, beformed integrally with the shaft. This gear meshes with another .gear:94 carried by a spindle 95 journaled in a suitable opening .in themember '88 parallel with the shaft 91. A disc 96 having a slightlygreater thickness than the width of the gears 93 and 94 is provided witha cloverlike aperture at its center to partially surround the gears andprovide intake and discharge ports. Outwardly of the disc 96 is aclosure disc 97, which, together with the disc 96, is suitably securedto the housing 88 by 'a plurality of screws 98. An :opening extendingthrough the disc 97 communicates with the intake side of the gear pumpand serves .to 'deliver lubricant from the sump to the pump. A dischargepassage is provided in the hous ing memberSS at the opposite .s'ide'ofthe gears 93 .and 94. This discharge passage, not shown herein butdisclosed in said parent application, communicates with an upwardlyextending passage 102 (Fig. 2 which receives a threaded nipple 103forming part of a union serving to connect the lower end .of a conduit104 with the reservoir pan. "This conduit at its upper end is con-.nected with the inlet opening .67 (Fig. 3) in the upper reservoir.

The reservoir pan is preferably provided with a spoutlike extension 109(Fig. l) which projects outwardly and upwardly from one wall of the sumpat an angle of about 45 A filling opening 110 (Fig. 3) is providedlengthwise of the spout and carries at its upper end a removable screwplug 110a (Fig. 2). On removal of the latter the lubricant in the sumpmay be replenished. An oil gauge,

At its inner end the shaft 91 :4

preferably in the form of a Lucite plug 111, similar to that disclosedin the patent to Sauer No. 2,301,460, granted November 10, 1942,extending from the outer end of the spout to the inner end thereof, maybe provided to indicate the level of the lubricant-in the sump.

To prevent overheating of the machine duringhigh speed operations overlong periods of time, special cooling means are provided. These includea disc 112 formed of a good heat conducting metal, such as copper oraluminum, secured in any suitable way to the shaft 23 intermediate theeccentrics 37 and 47. This disc serves to pick up heat from the shaftand its connected parts, by conduction, and the heat is then conveyedquickly to the periphery of the disc. The latter, by virtue of its rapidmovement, serves to transfer theheat to the air within the housing.Continuous movement of the air within the housing and constantwithdrawal of the heated air is effected by means of a fan 1-13 (Figs. 7and 8) which is secured to the inner face of the ha'ndwheel and pulley26 by means .of a plurality of screws 114. The fan comprises simply athin disc having bent up portions 115 projecting from the face thereofand extending radially outwardly from points near the axis of the pulleymember to the periphery thereof. The blades 115 provide a centrifugalblower action serving to discharge radially outwardly the air which isdrawn in adjacent the inner ends of the blades. Such air is suppliedthrough openings 116 (Fig. 9) provided through the upwardly extendingportion 17a of the frame around and closely adjacent tothe bea-ringsleeve 24. It will be apparent that in this way the heated air isconstantly withdrawn from the interior of the housing whenever themachine is in operation. Since the frame, as previously indicated, isnot air-tight, air may enter the same freely at a number of points toreplace the air withdrawn. The arrangement is such that a relativelylarge volume of air may be .drawn into and discharged from the interiorof the frame without producing high velocity movement of theair.Accordingly, very little lubricant is entrained in the air that iswithdrawn. To reduce further the tendency to entrain lubricant inthe airwithdrawn from thehousing, a guard-memher 117 (Figs. 3 and 5:) isprovided. This has a platelike portion 115 provided with openings119-adapted to receive the screws 61 and an opening 119a.throu gh which thewicking 75 may pass. The plate like portion 118 isinterposed between thetop of the frame extension 17a and the under surface of the strip 63. Adownwardly extending portion 120 of the guard member is slotted, asindicated at 121 (Fig. 5), to straddle the shaft 23. Pertion 120 extendsover the inner ends of the openings 1-16 through the frame but is spacedslightly therefrom. The arrangement is such that lubricant mist cannotbe discharged directly through the openings 116 but adequate space isprovided for the movement of ,air around the edges of portion 120 .at arelatively low velocity to the inner ends of the openings 116. Themajor-portion of any'lubricant mist thatmay'be entrained in the air'willbe deposited on the various interior surfaces, including those on themember 1-17, before the air reaches the fan. Such lubricant will thenbereturned-to the sump.

From the foregoing it will be seen that-the present invention providesfully automatic means for lubricating the various relatively movingsurfaces of the operating parts of an overedge sewing-machine of thecharacter indicated. The lubricant is continuously recirculated, in thecourse of supplying adequate lubricant to the surfaces requiring thesame, and through the provision of the 'fil- :ter ing means it -isinsured that only clean'lubricant is so supplied. This-is in-spiteof'the-accessibility of the lubricantto lint, filler-materials and otherobjectionable particles. As a consequence the machine is capable ofcontinuous operation at higher speeds than heretofore, and this is madefurther possible by the provision of the cooling means.

While an illustrative embodiment of the invention has been described inconsiderable detail and various modifications have been suggested, itwill be understood that numerous other changes may be made in theconstruction and arrangement of the various parts without departing fromthe general principles and scope of the invention.

What we claim is:

1. In a sewing machine having a frame carrying and substantiallyenclosing stitch forming and work feeding devices, a bearing mounted ina wall of said frame, a main operating shaft journaled in said bearingand projecting outwardly from said frame, connections for said shaft foroperating said devices, and a pulley on said shaft exterior of saidframe for driving the same, the combination of means for cooling theparts within said frame which comprises a heat conducting member mountedon said shaft for rotation therewith within said frame, said memberbeing in heat conducting relation to said shaft and having largesurfaces for transmitting heat therefrom to the air within said frame,and air suction means carried by said shaft exterior of said frameadjacent said pulley, said frame being provided with at least oneopening adjacent said shaft for the passage of air from within saidframe to said air suction means.

2. In a sewing machine having a frame carrying and substantiallyenclosing stitch forming and work feeding devices, means for creating alubricant mist within said frame, a bearing mounted in a wall of saidframe, a main operating shaft journaied in said bearing and projectingoutwardly from said frame, connections from said shaft for operatingsaid devices, and a pulley on said shaft exterior of said frame fordriving the same, the combination of means for cooling the parts withinsaid frame which comprises a heat conducting member mounted on saidshaft for rotation therewith within said frame, said member being inheat conducting relation to said shaft and having large surfaces fortransmitting heat therefrom to the air Within said frame, air suctionmeans carried by said shaft exterior of said frame adjacent said pulley,said frame being provided with at least one opening adjacent said shaftfor the passage of air from within said frame to said air suction means,and a shield adjacent the inner end of said bearing substantiallysurrounding said shaft and extending across the inner end of saidopening but spaced slightly therefrom, said shield serving to preventthe discharge of lubricant through said opening but enabling themovement of air around the shield and outwardly through the opening.

3. In a sewing machine having a frame carrying and substantiallyenclosing stitch forming and work feeding devices, a bearing mounted ina wall of said frame, a main operating shaft journaled in said bearingand projecting outwardly from said frame, a plurality of eccentrics onsaid shaft for operating said devices, and a pulley on said shaftexterior of said frame for driving the same, the combination of meansfor cooling the parts within said frame which comprises a disc formed ofa metal having high heat conductivity mounted on said shaft between twoof said eccentrics for rotation therewith within said frame, said diskbeing in heat conducting relation to said shaft and having largesurfaces for transmitting heat therefrom to the air within said frame,and air suction means carried by said shaft exterior of said frameadjacent said pulley, said frame being provided with at least oneopening adjacent said shaft for the passage of air from within saidframe to said air suction means.

4. In a sewing machine having a frame carrying and substantiallyenclosing stitch forming and work feeding devices, a bearing mounted ina wall of said frame, a main operating shaft journaled in said bearingand projecting outwardly from said frame, connections from said shaftfor operating said devices, and a pulley on said shaft exterior of saidframe for driving the same, the combina- 1 tion of means for cooling theparts within said frame which comprises a heat conducting member mountedon said shaft for rotation therewith within said frame,said member beingin heat conducting relation to said shaft and having large surfaces fortransmitting heat therefrom to the air within said frame, and airsuction means carried by said pulley, said frame being provided with atleast one opening adjacent said shaft for the passage of air from withinsaid frame to said air suction means.

5. In a sewing machine having a frame carrying and substantiallyenclosing stich forming and work feeding devices, a'bearing mounted in awall of said frame, a main operating shaft journaled in said bearing andprojecting- V outwardly from said frame, connecti0ns from said shaft foroperating said devices, means for supplying lubricant tosaidconnections, a portion of the lubricant being thrown from saidconnections upon operation thereof, and a pulley on said shaft exteriorof said frame for driv ing the same, the combination of means forcooling the parts within said frame which comprises a heat conductingmember mounted on said shaft for rotation therewith within said frame,said member being in heat conducting relation to said shaft and havinglarge surfaces for transmitting heat therefrom to the air within saidframe, air

suction means carried by said shaft exterior of said frame adjacent saidpulley, said frame being provided withat least one opening adjacent saidshaft for the passage of air from within said frame to said air suctionmeans, and a shield adjacent the inner end of said bearing substantiallysurrounding said shaft and extending across *the* inner end of saidopening but spaced slightly therefrom, said shield serving to catchlubricant entrained in the air in its movement toward said opening andto prevent the discharge of lubricant through said opening but enablingthe movement of air around the shield and outwardly through the opening.

6. In a sewing machine having a frame carrying and substantiallyenclosing stitch forming and work feeding devices, a bearingmounted in awall of said frame, a main operating shaft journaled in said bearing andprojecting outwardly from said frame, connections from said shaft foroperating said devices, means for supplying lubricant to saidconnections, a portion of the lubricant being thrown from saidconnections upon operation thereof, and a pulley on said shaft exteriorof said frame for driving the same, the combination'of means for coolingthe parts within said frame which comprises a heat conducting.

member mounted on said shaft for rotation therewith within said frame,said member being in heat conducting relation to said shaft and havinglargesurfaces for transmitting heat therefrom to the air within saidframe, air suction means carried by said shaft exterior of said frameadjacent said pulley, said frame being provided with at least oneopening adjacent said shaft for the passage of air from within saidframe to said air suction means, and,

means in the path of movement of air from within said frame to saidopening for collecting lubricant entrained in the air but enabling themovement of air to and through said opening. 7 a

References Cited in the file of this patent UNITED STATES PATENTS1,684,601 Shpater Sept. 18, 1928f 1,919,782 Fischbein July 25, 19332,483,036 Christensen Sept. 27, 1949 r 2,627,829 Wallenberg et al. Feb.10, 1953

